Id rather not spray pesticides all over my viburnums to kill the adult beetles. Is there another way to effectively protect my shrubs from the beetle?
Again, note the most effective means of control for viburnum leaf beetle is pruning and destroying infested twigs after egg laying has ceased in the fall — anytime from October to April. Research does suggest that soil application of a systemic insecticide such as imidacloprid is highly effective against viburnum leaf beetle. (Systemic insecticides are taken up by the plant and transported to the leaves where the beetles feed.) In fact, we have found this to be the most effective, longest-lived insecticide for control of the beetle. Please check with local Cooperative Extension office for local restrictions on the application of imidacloprid. In all of New York State, imidacloprid products, including Merit 75WP, are now restricted use pesticides, which means that only certified pesticide applicators can purchase and apply these products. Further, all consumer products containing imidacloprid are banned from sale and use on Long Island (Counties of Nassau, Suffolk, Queens and Kings). I
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